Remove local path discovery for AOT support

Keep it only for debug versions since it's useful when locally tweaking the templates during development.

Fixes #279

src/EmbeddedResource.cs

@@ -1,20 +1,14 @@
-//------------------------------------------------------------------------------
-// <auto-generated>
-//     This code was generated by a tool.
-//
-//     Changes to this file may cause incorrect behavior and will be lost if
-//     the code is regenerated.
-// </auto-generated>
-//------------------------------------------------------------------------------
-
+// <auto-generated />
 using System;
 using System.IO;
 using System.Linq;
 using System.Reflection;
 
 static class EmbeddedResource
 {
+#if DEBUG
     static readonly string baseDir = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location) ?? "";
+#endif
 
     public static string GetContent(string relativePath)
     {
@@ -33,9 +27,11 @@ public static byte[] GetBytes(string relativePath)
 
     public static Stream GetStream(string relativePath)
     {
+#if DEBUG
         var filePath = Path.Combine(baseDir, Path.GetFileName(relativePath));
         if (File.Exists(filePath))
             return File.OpenRead(filePath);
+#endif
 
         var baseName = Assembly.GetExecutingAssembly().GetName().Name;
         var resourceName = relativePath